Apparatus for guiding filaments onto bobbins



Dec. 31, 1935. KALFF 2,025,988

APPARATUS FOR GUIDING FILAMENTS ONTO BOBBINS Filed D80. 17, 1932INVENTOR. (7/7 /I74 FF) ATTORNEY.

Patented Dec. 31, 1935 UNITED STATES APPARATUS FOR GUIDING FmAMENTs ONTOBOBBINS Jan Kalfi, Ede, Netherlands, assignor, by mesne assignments, toAmerican Enka Corporation, Wilmington, Del., a corporation of DelawareApplication December 17, 1932, Serial No. 647,727 In Germany December21, 1931 1 Claim.

This invention relates to apparatus for guiding threads or filaments ofartificial silk and other textile fibers while running onto bobbins andis directed to certain improvements in such apparatus.

In apparatus of this character it has been customary to provide a meansfor holding a bobbin and a guide to hold the thread while it is beingwound on the bobbin. Usually the structure has been rigid causingcertain disadvantages. The guide was at varying distances from the woundthread which, particularly in the case of artificial silk, may causeflattening and distortion of the thread and interference with thewinding thereof on the bobbin. The tension of the prior art devices wasconstant so that breaks often occurred in the filaments comprising thethread.

The present invention is adapted to obviate the difiiculties of priordevices and it resides in the use of a guide which is mounted for freeoscillation and which is held in proper operative position by thetension of the thread. The tension is usually obtained by the resistanceof the spinning bath in the case of artificial silk, and the threadbeing in frictional contact with the guide counteracts the weightthereof and holds it a short distance from the outermost layer of thethread. There is thus substantially no tendency of the thread to flattenout.

The device according to the invention has the advantage over the usualthread guides that e. g. an untwisted thread of artificial silkconsisting of many capillary filaments preserves its circular crosssection in running onto the bobbin, on account of the very shortdistance between the thread guide and the outermost layer of threads onthe bobbin, while with the thread guides as used hitherto said circularcross section is changed into a rectangular one and the round threadinto a small band. Thereby the threads obtain a different length at theend of each layer of threads on account of the change of direction ofthe thread windings which then takes place. This difierence in lengthmay cause the formation of eyes in twisting which are the reason fordamages to the rayon which become evident only after the operationsfollowing the twisting process.

In the accompanying drawing constituting a part hereof, and in whichlike references indicate like parts,

Figure 1 is a side elevational view, some parts being shown in crosssection,

Figure 2 a front view of an apparatus for winding a thread of artificialsilk on a bobbin;

Figure 3 shows a plan view and Figure 4 a cross section of a suitablethread uide.

According to Figures 1 and 2 the device for guiding the artificial silkthread I vertically upward from the spinning bath 2 to the bobbin 3 5consists of arod, bar or the like 4, arranged in parallel direction tothe axis ID of the bobbin 3 and reciprocating parallel to said axis I0,and of a swinging arm or guide 5 which is mounted for free oscillationon the rod 4 by means of any suitable connection, e. g. a sleeve II(Figure 2) in such a manner that it takes part in the reciprocatingmovement of the rod 4. The swinging arm 5 terminates in a narrow eye 6serving as the actual thread guide and with which the thread makesfrictional contact. The opening I3 of this eye is turned toward andfaces the bobbin 3.

As illustrated, the swinging arm 5 is inclined toward the bobbin 3. Ifthe thread I, the direction of which is changed by the draw roller Ifrom the vertical to the upwardly inclined direction, did not possessany tension, the eye 6 would be in contact with the bobbin or the bobbinlap on account of the weight of the swinging arm 5. But due to thethread tension the eye is kept at a short distance from the outermostlayer 8 of threads on the-bobbin. Thus, it can not slide or rub on thethreads already wound. The distance between the eye 6 and the outermostlayer 8 of threads depends on the thread tension, the weight of theswinging arm 6 and the angle of running onto the bobbin or the angle ofdeviation. It is so short and the thread guide 6-the eyeis of such shapethat the thread will not be wound on the bobbin in the form of a smallband of rectangular cross section but will preserve its circular shape,in contrast to the thread guides as used hitherto.

The Figures 3 and 4 illustrate in enlarged form the upper part of theswinging arm 5 terminating in the eye 6. I3 indicates the hole by whichthe thread I is guided to the bobbin and I2 an opening in the eye 6through which the thread is introduced into the hole I 3 and which isarranged in such a manner that slipping out of the thread I from thehole I3 is absolutely impossible.

Although I have described a single specific apparatus, my invention isnot limited thereto as modifications may be made by those skilled in Ithe art in accordance with the principles herein set forth. For example,the eye 6 need not have a split opening I2 but may be solid. A differenttype of guide may be substituted therefor. The guide 5 may be mounted ina difierent manner,

including an arm provided with an eye, said arm of the thread guidebeing attached to a traverse bar in a manner to permit free transverseoscillation of the guide with respect to the bar, said guide being solight in weight that the tension in 5 a freshly spun thread issufiicient to maintain the guide eye at a constant distance from a bodyof thread as it is increased in size bythe collection of thread passingthrough said eye thereby to avoid injury to the thread.

JAN KALFF.

